Thames & Kosmos Ooze Labs: Chemistry Station handleiding

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› › › EXPERIMENT 20

Ooze Labs Chemistry Station

Separating mixtures

YOU WILL NEED

Funnel, filter paper, tall wide test tube, chemistry

station, large measuring cup, measuring spoon,

water, soil, sand

HERE’S HOW

1. Fold the filter down the middle. Fold the

resulting semicircle again. This will give you a

little cone. Set the filter cone in the funnel and

moisten it with a little water to help it stick to

the sides of the funnel. Place the funnel and

filter paper into the tall wide test tube. Attach

the test tube to the chemistry station.

2. Fill the large measuring cup with 50 ml of

water and then add some soil and sand. Mix

the soil and sand into the water using the

spoon.

3. Let the mixture sit for a few minutes, and

observe.

4. Pour the dirty water mixture into the filter

paper in the funnel. What do you observe

happens as you do?

5. Let the test tube sit until the filter paper has

dried out. Inspect the contents of the filter

paper. What do you observe?

2 3

WHAT’S HAPPENING

This experiment shows that you can separate mixtures physically. First, the sand sunk to the

bottom of the cup because it’s heavier than water. This is called sedimentation. Then, you

separated the soil and sand particles from the water through filtration, which is the process of

separating solid particles from a liquid. The filter paper contains small holes which prevent

large solid particles from passing through. However, the much smaller water molecules are

able to easily pass through the filter. The filter paper is not perfect; some small particles

were still able to pass through the filter. Filtration is used in the process of making coffee.

The coffee filter prevents the large coffee grounds from going into the cup of coffee but lets

the water-coffee solution and smaller coffee particles through.

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